A justacorps or justaucorps (/ˈʒuːstəkɔːr/)[1] is a knee-length coat worn by men in the latter half of the 17th century and throughout the 18th century. It is of French origin, where it had developed from a cape-like garment called a casaque.[2] It was introduced into England as a component of a three-piece ensemble, which also included breeches and a long vest or waistcoat. This ensemble served as the prototype for the modern-day three-piece suit. The justacorps itself evolved into the frock coat.[3]
The fabric selection and styling of the justacorps varied over time, as fashions altered through history.[4] Elaborated forms featuring rich embroidery and embellishments were influenced by Indo-Persian and Turkish garments, which cultures influential Europeans were increasingly in contact with, through travel, trade, and diplomatic missions.[5][6] East European garments of similar cut became fashionable around the same time as the justacorp arrived in Western Europe, and its construction and decoration were also influenced by "oriental" modes.[7]